How many different combinations of three books can be selected from 40 books?
1 answer:
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Answer:
<h2>68 is the fourth number.</h2>Step-by-step explanation:
The average of the 4 numbers is 45.
Hence, the total of the four numbers is = 180.
The given three numbers are 24, 36, 52.
The total of the given three numbers is (24 + 36 + 52) = 112.
The fourth number will be (180 - 112) = 68.
The formula to find speed:
We first need to find the distance to gift store:
18/60 × 10
=3miles
We can then find the time he used down hill:
3÷30×60
=0.1×60
=6 minutes
In total he walked:
3x2
=6miles
We can then find his average speed by dividing the distance by total time used:
=6÷(6+18)/60
=6÷24/60
=15mph
The answer is 15mph.
Hope it helps!
We first need to find the distance to gift store:
18/60 × 10
=3miles
We can then find the time he used down hill:
3÷30×60
=0.1×60
=6 minutes
In total he walked:
3x2
=6miles
We can then find his average speed by dividing the distance by total time used:
=6÷(6+18)/60
=6÷24/60
=15mph
The answer is 15mph.
Hope it helps!
Answer:
D)
Step-by-step explanation:
Acceleration is the derivative of velocity, which is the derivative of position, so we must differentiate the function twice:
Position of Particle:
Velocity of Particle:
Acceleration of Particle:
After seconds, the acceleration of the particle is